It's hard to tell if Justin Timberlake's "Can't Stop The Feeling" (RCA) will relinquish the #1 spot this week to The Chainsmokers' "Don't Let Me Down" f/Daya (Disruptor/Columbia), but it's going to be very close. Meanwhile there are two new songs joining the Top 10, James Bay's "Let It Go" (Republic) and this week's Greatest Gainer, Sia's "Cheap Thrills" (RCA). Kent Jones joins the Top 20 with "Don't Mind" (WetheBest/Epic). Shawn Mendes' "Treat You Better" (Island/Republic) is soaring up the chart, moving from #33 to #26. Joining the T40 this week will be Fifth Harmony's "All In My Head" (SYCO/Epic) and do not be surprised if Hollywood's Jordan Fisher jumps up there too with "All About Us."